Reuters: A coalition of environmental groups launched a second legal challenge against Enbridge Inc's Northern Gateway crude oil pipeline on Friday, asking a Canadian court to quash federal approval that they say was based on a flawed report. The same group filed a lawsuit in January over a preliminary approval by the Joint Review Panel, which found the C$7.9 billion ($7.36 billion) project posed little risk to the environment provided Enbridge complied with 209 conditions. The Canadian government green...